EP0416936A2
Expired / Lapsed
EP
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Liquid crystal display device
Assignee: Fujitsu Ltd
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Filing: 1990-09-07
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Granted: —
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Expires: 2010-09-07
Abstract
Abstract A liquid crystal display device which comprises an orientation film and at least one charge transporting material doped in the orientation film, the charge transporting material and an amount thereof being sufficient to cause a leakage of an electric charge temporarily accumulated in the orientation film or a portion adjacent thereto, during an operation of the device, to thereby inhibit a formation of an electric bilayer in the device. Since the formation of an electric bilayer is inhibited, a generation of crosstalk and reduction of display characteristics such as memory properties of the LC display device can be effectively prevented.
Inventors
- 👤 Akihiro Mochizuki
- 👤 Masayuki Haitsu Nagamine A-205 Iwasaki
- 👤 Mitsuaki Hirose
- 👤 Shunsuke Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; C; C09; C09K; C09K19/00; C09K19/02; C09K19/0208; C09K2323/00; C09K2323/04; C09K2323/06; C09K2323/061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A liquid crystal display device characterized by comprising an orientation film and at least one charge transporting material doped in the orientation film, the charge transporting material and an amount thereof being sufficient to cause a leakage of an electric charge temporarily accumulated in the orientation film or a vicinity thereof during an operation of the device, to thereby inhibit a formation of an electric bilayer in the device.
Claim 2
Dependent Claim
69 words
A liquid crystal display device characterized by comprising an orientation film and at least one charge transporting material doped in the orientation film, the charge transporting material and an amount thereof being sufficient to cause a leakage of an electric charge temporarily accumulated in the orientation film or a vicinity thereof during an operation of the device, to thereby inhibit a formation of an electric bilayer in the device.
Claim 3
Dependent Claim
20 words
A liquid crystal display device according to claim 1, characterized in that the orientation film is a layer of polyimide.
Claim 4
Dependent Claim
29 words
A liquid crystal display device according to claim 1 or 2, characterized in that the liquid crystal material used in the device is a super twisted nematic liquid crystal.
Claim 5
Dependent Claim
28 words
A liquid crystal display device according to anyone of claims 1 to 3, characterized in that the device is driven in accordance with a simple matrix address system.
Claim 6
Dependent Claim
92 words
A liquid crystal display device according to claim 4, characterized in that the device has a panel structure, and comprises a first glass substrate having stripe electrodes and an orientation film formed in sequence on a surface of the substrate, an opposed second glass substrate having stripe electrodes, perpendicular to the longitudinal direction of the stripe electrodes of the first glass substrate, and an orientation film formed in sequence on a surface of the substrate, and a liquid crystal material sandwiched between the opposed orientation films of the first and second substrates.
Claim 7
Dependent Claim
32 words
A liquid crystal display device according to any one of claims 1 to 3, characterized in that the device is driven in accordance with an active matrix address system using thin-film transistors.
Claim 8
Dependent Claim
76 words
A liquid crystal display device according to anyone of claims 1 to 6, characterized in that the charge transporting material is a hole-transporting material represented by the general formula (I): in which R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom, an alkyl group of 1 to 4 carbon atoms, or an alkylamino group wherein an alkyl moiety contains 1 to 4 carbon atoms and may be substituted.
Claim 9
Dependent Claim
66 words
A liquid crystal display device according to anyone of claims 1 to 6, characterized in that the charge transporting material is a hole-transporting material represented by the general formula (II): in which R represents a hydrogen atom, an alkyl group of 1 to 4 carbon atoms, or an alkyl- or dialkylamino group wherein an alkyl moiety contains 1 to 4 carbon atoms and may be substituted.
Claim 10
Dependent Claim
31 words
A liquid crystal display device according to any one of claims 1 to 6, characterized in that the charge transporting material is an electron-transporting material represented by the general formula (III):
Claim 11
Dependent Claim
34 words
A liquid crystal display device according to claim 1, characterized in that the orientation film exhibits an electrically insulating characteristic under direct current electric field, and electric conductive characteristic under high frequency electric field.
References Cited (Backward Citations)
No citation records indexed.
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